Fluid motor



7 Nov. 26, 1935.

A. L. HAMPTON FLUID MOTOR Filed Feb. 8, 1932 2 Sheets-Sheet 1 Nov. 26, 1935. A. L. HAMPTON FLUID MOTOR Filed Feb. 8, 1952 Sheets-Sheet 2 Jmnto a Patented Nov. 26, 1935 UNITED STATES PATENT OFFICE FLUID MOTOR v Audrey Hampton, Houston, Tex. Application February 8, 1932, Serial No. 591,519

6 Claims. (01.121-101) I t a be reciprocated by an operating fluid under pressure.

Another object of the invention is to provide ,a fluid motor havingnovel means for controlling the application of the operating fluid.

With the above. and other. objects in View this invention has particular relation to certain novel features of construction, operation and arrangement, of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein::-

'Figure 1 shows a plan view of the device as mounted on a derrick floor and connected to a pipe tong.

Figure 2 shows a fragmentary side view of a modified. form of the device.

Figure 3 shows a longitudinal sectional view thereof showing the parts as positioned at the end of the work stroke, and

Figure 4 shows a longitudinal sectional view showing the parts as positioned atthe beginning of thework stroke.

In the drawings the numeral I designates a cylinder, one end of which is equipped with a stufling box 2 and whose other end has the end cap. 3 screwed thereon. Threaded into the outer end of the cap 3 there is a tubularneckt whose outer end terminates in a ball joint member 5 which works ina socket Band is retained therein by the retainer plate I. This socket 6 is formed in the head 8, supported on the tripod 9 which is mounted on a suitable support and the retainer plate I is bolted to said head.

In thecylinder I there is a piston III which is equipped 'with a suitable stuffing box II. There is an inner cylinder I2, one end of which is anchored to the neck 4 and this cylinder I2 is fitted through the stufling box II and is extended out beyond the opposite end of the cylinder I. Anchored to the piston I and working through the stufling box 2 there is a tubular piston rod I3 which surrounds and is spaced from the inner cylinder I2 and to the outer end ofthe piston rod l3, and closing said end, a head I4 is attached.

Adjacent the piston I0, the piston rod I3 is provided with one vor more ports as I and spaced outwardly beyond these ports are the ports I6 through the wall of the inner cylinder I2.

There is aplunger H which works in the inner cylinder I2 and a plunger rod IB is attached at one end to said plunger and at its other end to the head I4. 1

A supply line I9 for pressure fluid such a steam, enters the head 8 and is controlled by a suitable valve 20 through which pressure fluid may be supplied to the cylinder l2 through the passageway 2I through the neck 4. The outer 5 end .of this passageway H is flared so that the passageway 2] will not be closed by the movement of the ball joint member 5 in the socket 6 as the apparatus is adjusted into different positions.

There is a relief pipe 23 connected into the exhaust passageway 2| and also connected into the cylinder I in front of said exhaust passageway and this bypass pipe is equipped with valve 24 by means of which it is normally closed. In case of an overload sufficient to stall the piston II] before it has completed its rearward movement and it be, desired to relieve the pressure in front of said piston ID the valve 24 may be opened for this purpose, preparatory to another forward movement of said piston. As illustrated in Figure 1 the free end of the piston rod I3 is connected to the handle of a pipe grip tong 25 which is shown as applied to the casing or pipe 26 shown in connection with the 0011- ventional rotary drilling machine 21. The piston 25 rod I3 is connected to the tong handle in this instance by flexible cable 28. As illustrated in Figure 1 the apparatus is mounted to be used for breaking up the string of pipe 26 as said string is withdrawn from the bore. When used for this purpose, upon the admission of steam, or other pressure fluid, through the passageway 2| and into the cylinder I2, said fluid will operate against the plunger H to drive the same forwardly, that is, to the left, as illustrated. Since there is very little load onthe head l4, upon such movement, the plunger I'I will over run the ports I6, I6. Fluid under pressure will then pass through the ports I6 and enter the tubular piston rod I3 and will also pass through the ports I5 and into the cylinder I. On account of the relative volumes of the tubular piston rod I3 and the cylinder I, and the throttling effect of the ports I6, I5, some time will elapse before thepressure in the piston rod I3 and cylinder I begins to move the piston I0 to the right, and during that time, the plunger I! will pass somewhat beyond, or to the left of the ports it. As the piston It! moves to the right, the plunger I! will out off the ports I6 and the expanding force of the steam, or other pressure 5 fluid, will move the piston It] to the right to uncover the exhaust passageway 2|. As soon as the pressure fluid exhausts, the pressure acting against the plunger II will again move it to the left-and as there is no substantial load to be 56' it will again over run the ports l6, and the above cycle will be repeated. Upon movement of the piston l forwardly, or to the left, when it covers the exhaust passageway 2!, the steam trapped ahead of the piston will act as a cushion. This steam, however, will not be under high compression, and also will condense somewhat so that the piston may move forwardly far enough to permit the operation as above stated, and likewise, when the piston I0 moves to the right, it is moving under the influence of the pressure of the operating fluid behind it, and consequently will be carried somewhat beyond the outlet passageway 21 in its movement to the right before full force-50f the pressure fluid has escaped through the passageway 2|. The air trapped in the cylinder to the right of the piston HI will be placed under compression and will act as a cushion for the piston l0.

As illustrated in Figure 2 the piston I3, is connected to the free end of, the tong handle by means of a rigid connecting. rod 2a but the operation of the apparatus is the same as hereinabove explained.

The apparatus may be used as well for screwing up joints of pipe as for breaking said joints by suitably applying the tong and connecting the fluid motor thereto for operating the tong to. the right in case ,the connecting threads are right hand threads.

As is well known to those familiar with the art of well drilling, the tong 25. will usually be suspended in the derrick by any suitable appliance applicable for the purpose and a fluid motor may also be suspended by means of a wire. or chain engaged in the eye 30.

The motor may be applied for moving heavy objects about the derrick floor by attaching the cable 28 or the rod 29 to the object and then suitably applying the fluid pressure to, accomplish the desired purposes.

The drawings and description disclose what is now considered to be a preferred form of the invention by way of illustration only while the broad principle of the invention will be defined by the appended claims.

What I claim is:

1. In apparatus of the character described an outer cylinder and an inner cylinder anchored inthe outer cylinder, a piston closely surrounding the inner cylinder and working in the outer cylinder, a plunger inthe inner cylinder, a tubular piston rod anchored to said piston around and spaced from the inner cylinder, means connecting the plunger to said piston rod, means through which pressure fluid may be admitted into said inner cylinder, said inner cylinder having a port arranged to be cleared by the plunger, when the latter is moved forwardly to'permit the admission of the pressure fluid into the space between the inner cylinder and piston rod and said piston rod having a port arranged to permit said admitted fluid to enter the outer cylinder in front of said piston, whereby the movement of the piston and plunger is reversed, said outer cylinder having an exhaust port arranged to be closed by the piston upon its forward movement and to be cleared by said piston upon its reverse movement.

2. In apparatus of the character described, an outer cylinder having an exhaust port, an inner cylinder therein anchored to said outer cylinder and having an inlet port, means for admitting pressure fluid into the inner cylinder, a piston in the outer cylinder around the inner cylinder,

moved by the plunger II, as it ,moves to the left,

a piston rod around the inner cylinder connected to said piston, a plunger in the inner cylinder connected to the piston rod, sealing means forming a fluid tight joint between the outer cylinder and piston rod forming a pressure chamber bc- 5 tween said piston and sealing means, said plunger and piston being movable simultaneously to open the inlet port and close the exhaust port and into another position to close said inlet port and open the exhaust port. 3. In an apparatus of the character described an outer cylinder having an exhaust port, an inner cylinder one end of which is anchored to one end of the outer cylinder, a stuffing box at the other end of said outer cylinder, a piston in the outer cylinder around the inner cylinder, a tubular piston rod attached to said piston, at

-- one end, and whose other end is closed and works through said stufiing box, a plunger in said inner cylinder connected to said piston rod, inlet ports for the inner cylinder and piston rod, respectively, said plunger and piston being movable in one direction into position to open saidcylinder inlet port and to close said exhaust port, means for applying pressure fluid, through said piston rod and port against said piston'to move the piston and plunger in another direction to; close said cylinder inlet port and to open said exhaust port.

4. Apparatus of the character described com- 3Q prising an outer cylinder, an inner cylinder one end of which is connected to the corresponding end of the outer cylinder-and provided with an inlet for pressure fluid and whose other end is open, a piston in said outer cylinder around the inner cylinder, a tubular piston rod around the inner cylinder whose inner end is attached to the piston and whose outer end is closed, means forming a seal between the piston rod and outer cylinder whereby a pressure shoulder is formed 40 in said outer cylinder, a plunger in the inner cylinder, means connecting the plunger to the piston rod, said inner cylinder and said piston rod each having an inlet port and said pressure chamber having an exhaust port,- said plunger and piston being movable into one position to close said exhaust port and to open said inlet ports whereby the pressure will be admitted into the open end of the inner cylinder and intov said chamber and being movable into another posi- 5 tion to open said exhaust, port andv to close said inlet ports.

5. Apparatus of the character described com prising an outer cylinder, an inner cylinder one end of which is connected to the corresponding 5 end of the outer cylinder and. provided with an inlet for pressure fluid and whose other end is open, a piston in said outer cylinder around the inner cylinder, a tubular piston rod around the inner cylinderwhose inner end is attached to the piston and whose outer end is closed, means forming a seal between the piston rod and outer cylinder whereby a pressure shoulder is formed in said outer cylinder, a plunger in the inner w cylinder, means connecting the plunger to the piston rod, said inner cylinder and said piston rod each having an inlet port and said pressure chamber having an exhaust port, said plunger and piston being movable into one position to 7.0: close said exhaust port and toopen said inlet ports wherebythe pressure will be admitted into the open end of the inner cylinder and into said chamber and being movable into another position to open said exhaust port and to close, said 7i inlet ports, and a valve controlled bypass conduit leading out from said chamber.

6. Apparatus of the character described comprising an outer cylinder, an inner cylinder one end of which is connected to the corresponding end of the outer cylinder and provided with an inlet for pressure fluid and whose other end is open, a piston in said outer cylinder around the inner cylinder, a tubular piston rod around the inner cylinder whose inner end is attached to the piston and whose outer end is closed, means forming a seal between the piston rod and outer cylinder whereby a pressure shoulder is formed in said outer cylinder, a plunger in the inner cylinder, means connecting the plunger to the piston rod, said inner cylinder and. said piston rod each having an inlet port and said pressure chamber having an exhaust port, said plunger and piston being movable into one position to close said exhaust port and to open said inlet ports whereby the pressure will be admitted into the open end of the inner cylinder and into said chamber and being movable into another position to open said exhaust port and to close said 10 inlet ports and means for operatively connecting said piston rod to the work.

AUDREY L. HAMPTON. 

